Jeep Grand Cherokee WK. Manual — part 1040
P0703-BRAKE SWITCH 2 PERFORMANCE (CONTINUED)
2.
(F942) FUSED IGNITION SWITCH CIRCUIT
Turn the ignition off.
Disconnect the Stop Lamp Switch harness connector.
Using a 12-volt test light connected to ground, probe the (F942) Fused
Ignition Switch Output circuit in the Stop Lamp Switch harness con-
nector.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (F942) Fused
Ignition Switch Output circuit. Inspect the related fuse and
repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
3.
STOP LAMP SWITCH
Turn the ignition off.
Measure the resistance between the (F942) Fused Ignition Switch Output circuit terminal and the (B16) Brake
Switch No.2 Signal circuit terminal in the Stop Lamp Switch.
Measure the resistance between the (Z904) Ground circuit terminal and the (B15) Brake Switch No.1 Signal terminal
in the Stop Lamp Switch.
Apply and release the Stop Lamp Switch while monitoring the ohmmeter.
Does the resistance change from below 5.0 ohms to open circuit for each circuit check?
Yes
>> Go To 4
No
>> Replace the Stop Lamp Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Disconnect the C3 PCM harness connector.
Measure the voltage on the (B16) Brake Switch No.2 Signal circuit in
the Stop Lamp Switch harness connector.
Ignition on, engine not running.
Is the voltage above 0 volts?
Yes
>> Repair the short to battery voltage in the (B16) Brake
Switch No.2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
9 - 756
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0703-BRAKE SWITCH 2 PERFORMANCE (CONTINUED)
5.
(B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (B16) Brake Switch No.2 Signal circuit
from the Stop Lamp Switch harness connector to the C1 FCM harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (B16) Brake Switch No.2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
6.
(B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (B16) Brake Switch
No.2 Signal circuit in the Stop Lamp Switch harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to ground in the (B16) Brake Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 757
P0703-BRAKE SWITCH 2 PERFORMANCE (CONTINUED)
7.
(B15) BRAKE SWITCH NO.1 SIGNAL CIRCUIT OPEN
Measure the resistance of the (B15) Brake Switch No.1 Signal circuit
from the Stop Lamp Switch harness connector to the appropriate ter-
minal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 8
No
>> Repair the open in the (B15) Brake Switch No.1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
8.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 758
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0850-PARK/NEUTRAL SWITCH PERFORMANCE
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 759
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